PAPER / ARXIV:2609.15251
LHCb collaboration : R. Aaij , M. Abdelfatah , A.S.W. Abdelmotteleb , C. Abellan Beteta , F. Abudinén , T. Ackernley , A.A. Adefisoye , B. Adeva , M. Adinolfi , P. Adlarson , C. Agapopoulou , C.A. Aidala , S. Akar , K. Akiba , H. Al Saleh , P. Albicocco , J. Albrecht , R. Aleksiejunas , F. Alessio , P. Alvarez Cartelle , S. Amato , J.L. Amey , Y. Amhis , Z. Amos , L. An , L. Anderlini , P. Andreola , M. Andreotti , S. Andres Estrada , A. Anelli , D. Ao , C. Arata , F. Archilli , Z. Areg , M. Argenton , S. Arguedas Cuendis , L. Arnone , M. Artuso , E. Aslanides , R. Ataíde Da Silva , M. Atzeni , B. Audurier , J.A. Authier , D. Bacher , I. Bachiller Perea , S. Bachmann , M. Bachmayer , J.J. Back , M. Bai , Z.B. Bai , V. Balagura , A. Balboni , W. Baldini , Z. Baldwin , L. Balzani , H. Bao , J. Baptista de Souza Leite , C. Barbero Pretel , M. Barbetti , I.R. Barbosa , W. Barker , R.J. Barlow , M. Barnyakov , S. Baron , S. Barsuk , W. Barter , J. Bartz , S. Bashir , B. Batsukh , P.B. Battista , A. Bavarchee , A. Bay , A. Beck , M. Becker , F. Bedeschi , I.B. Bediaga , N.A. Behling , S. Belin , A. Bellavista , I. Belyaev , G. Bencivenni , E. Ben-Haim , J.L.M. Berkey , R. Bernet , A. Bertolin , L. Bertsch , F. Betti , J. Bex , O. Bezshyyko , S. Bhattacharya , M.S. Bieker , N.V. Biesuz , A. Biolchini , M. Birch , F.C.R. Bishop , A. Bitadze , A. Bizzeti , T. Blake , F. Blanc
RESUMO
The first search for the beauty baryon decays $\Xi_{b}^{0} \to \Xi^{0} J/\psi$ and $\Xi_{b}^{0} \to \Xi^{0} \psi(2S)$ is presented using the proton-proton collision dataset collected by the LHCb experiment between 2016 and 2018, corresponding to an integrated luminosity of $5.4\,\mathrm{fb}^{-1}$. The first observation of the decay $\Xi_{b}^{0} \to \Xi^{0} J/\psi$ is reported and evidence of the decay $\Xi_{b}^{0} \to \Xi^{0} \psi(2S)$ is presented. The $\Xi^{0}$ hyperon is fully reconstructed for the first time at an LHC experiment, which is achieved using the $\Xi^{0} \to \Lambda \pi^{0}$ decay. The ratio of the branching fractions is measured as $\frac{\cal{B}(\Xi_{b}^{0} \to \Xi^{0} \psi(2S))}{\cal{B}(\Xi_{b}^{0} \to \Xi^{0} J/\psi)} = 0.59 \pm 0.19 \text{(stat)} \pm 0.04 \text{(syst)}$.
NO MESMO MAPA